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The prime factors of 28 are 2 and 7. Their sum is 9.
The factors of -84 that equal the sum of -16 are: -28 and 12 -14 and -2 -12 and -4
1 + 2 + 3 + 4 + 6 + 12 = 28
Factors of 28 are 1, 2, 4, 7, 14, and 28. Factors of 66 are 1, 2, 3, 6, 11, 22, 33, and 66. The only common factors of 28 and 66 are 1 and 2.
2 3 5 7 11 Sum: 28 Product: 2310